The "motor unit" in vertebrate skeletal muscle refers to
A)one actin binding site and its myosin partner.
B)one sarcomere and all of its actin and myosin filaments.
C)one myofibril and all of its sarcomeres.
D)one motor neuron and all of the muscle fibres on which it has synapses.
E)an entire muscle.

Question

Quizplus · Accepted Answer

The "motor unit" refers to one motor neuron and all of the muscle fibers on which it has synapses, allowing for coordinated muscle activity in response to neural stimulation. Options A, B, and C refer to smaller components within muscle fibers, while option E refers to an entire muscle, which can contain multiple motor units.

The "Motor Unit" in Vertebrate Skeletal Muscle Refers to